EP0672379A1 - Système pour obtenir des images dentaires - Google Patents

Système pour obtenir des images dentaires Download PDF

Info

Publication number
EP0672379A1
EP0672379A1 EP94117811A EP94117811A EP0672379A1 EP 0672379 A1 EP0672379 A1 EP 0672379A1 EP 94117811 A EP94117811 A EP 94117811A EP 94117811 A EP94117811 A EP 94117811A EP 0672379 A1 EP0672379 A1 EP 0672379A1
Authority
EP
European Patent Office
Prior art keywords
housing
optical assembly
bayonet
imager
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94117811A
Other languages
German (de)
English (en)
Inventor
Richard A. Tamburrino
Roger W. Leseberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welch Allyn Inc
Original Assignee
Welch Allyn Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Welch Allyn Inc filed Critical Welch Allyn Inc
Publication of EP0672379A1 publication Critical patent/EP0672379A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00174—Optical arrangements characterised by the viewing angles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00096—Optical elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00064—Constructional details of the endoscope body
    • A61B1/00071—Insertion part of the endoscope body
    • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
    • A61B1/00101—Insertion part of the endoscope body characterised by distal tip features the distal tip features being detachable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
    • A61B1/05—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances characterised by the image sensor, e.g. camera, being in the distal end portion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
    • A61B5/0088—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for oral or dental tissue

Definitions

  • This invention relates to imaging devices for the inspection of poorly accessible locations. More particularly this invention relates to an imaging system suitable for dental applications wherein it is desirable to interchange optical assemblies
  • Borescopes and endoscopes are well known imaging apparatus utilizing charge coupled devices (CCD) as photosensors.
  • CCD charge coupled devices
  • the device accept interchangeable optical assemblies, without increasing the size of the device's profile or disturbing the smooth continuity of its exterior surface.
  • an imaging system of the type having an optical assembly that can be removably attached to an elongated housing for insertion therewith into a narrow orifice.
  • the housing has an imager such as a CCD array disposed therein.
  • a connector is centered on the distal end of the housing and has a radially outermost surface.
  • the removable optical assembly is adapted to mate with the connector, such that the optics within the assembly and projects an image of a target being viewed onto the imager.
  • the housing has at least one illuminator which transmits light energy through the distal end of the housing via ports that are farther from the axis than the outermost surface of the connector.
  • the illuminator comprises a first light guide disposed within the housing that extends to the distal face for transmitting light rays therethrough.
  • the optical assembly has a second light guide formed therein that aligns with the first light guide so that light energy continues therethrough to illuminate the target being viewed.
  • the connector and the optical assembly are provided with a bayonet fitting for achieving a secure connection therebetween.
  • the connector is provided with an outwardly directed cylindrical rim having a plurality of bayonet tracks formed therein, and the optical assembly has a recess dimensioned to snugly receive the cylindrical rim.
  • a plurality of bayonet pins project inwardly from a wall of the recess and are carried in the bayonet tracks.
  • the bayonet tracks each have a first arm that has a generally longitudinal orientation and a second arm that has a generally cross-longitudinal orientation.
  • the system can be employed for dental imaging, wherein the housing has an elliptical profile and is dimensioned to fit in the mouth of a patient.
  • the housing further has a smooth, continuous exterior surface for receiving a protective sheath thereon.
  • the exterior surface of the optical adapter is aligned with the exterior surface of the housing to form a smoothly continuous surface.
  • System 10 includes a housing 12 that has a smooth external surface and is preferably elliptical in profile. It has been found that an elliptical shape promotes grasping with the hand during manual manipulation of the device in the mouth of a patient.
  • a compact imager 14 Disposed in the distal portion of the housing 12 is a compact imager 14 which is preferably a packaged charge-coupled device supplied with integrated electronics, and having a transparent window 16 at its distal end that permits an image to be focused upon an photosensitive area of the imager 14.
  • a suitable window is provided in the distal end 24 of the housing to permit light to pass therethrough and into the imager 14.
  • a plurality of connector pins 18 extend proximally from the imager 14 to join an electrical harness 20 that carries necessary power and input signals to the imager 14, and carries output signals from the imager to video processing electronics (not shown).
  • FIGS. 1 and 9 are shown a plurality of light guides 22, 22', 23, 23'.
  • the light guides are disposed between the exterior wall of the housing 12 and the imager 14. Beginning at the distal face 24 of the housing 12, they run proximally in a generally longitudinal direction, turning medially to unite in a common bundle 26 which runs proximally toward a light source (not shown) which typically is a high intensity metal halide discharge lamp.
  • Power can be supplied to the imager 14 and to the lamp from a battery (not shown) disposed in the housing 12, or from an external source.
  • a outstanding bayonet adapter 50 extends distally beyond the distal face 24. It has a cylindrical outer wall 52 disposed inwardly of the light guides 22, 22', 23, 23', which attaches to the distal face 24 of the housing 12.
  • An o-ring 51 seats in a groove 53 located at the base of the bayonet adapter 50. Its function is to aid in locking the bayonet connection and retaining the optical assembly.
  • a plurality of bayonet tracks 54a - 54d are placed at intervals along the circumference of the rim 52. Each track has a relatively short longitudinal arm 55a - 55d and a longer cross-longitudinal arm 56a - 56d.
  • the light can pass through the transparent plate 16. As best seen in FIG. 1, the light then passes through two windows 16, 17 that are made of a glass having a high refractive index to strike the photosensitive area of the imager 14.
  • a glass having a refractive index Nd 1.85, such as LaSF9, available from Schott Optical Glass, Inc., Duryea PA, is suitable.
  • the windows 16, 17 are an important feature of the invention. Their presence allows the physical distance between the objective lens 38 and the imager 14 to be long enough to allow the bayonet mechanism to be placed in the receive path, where it can be made smaller than the elliptical cross section of the distal face 24.
  • FIGS. 12 and 13 there is shown schematically an arrangement that is found in prior art imaging systems, in which an objective lens system 138 is disposed in front of a CCD imager 114. Principal rays 139, 139' pass through the lens system 138 and are transmitted to the active region of the imager 114.
  • FIG. 13 there is shown schematically an optical arrangement in accordance with the invention, in which the same lens system 138 receives principal rays 149, 149'.
  • the rays 149, 149' define the same field of view as the rays 139, 139' of FIG. 12, and they pass through the lens 138 in the same manner as in the prior art arrangement of FIG. 12. But now rays 149, 149' pass in turn through windows 117, 118, which are made of a high index glass that refracts the rays inward. When the rays 149, 149' finally strike the same active area of 114 as did rays 139, 139', it will be evident that they have traveled a larger longitudinal distance measured between the lens 138 and the imager 114.
  • the bayonet adapter 50 can be interposed therebetween in the arrangement of FIG. 13, whereas this could not practically be done in FIG. 12 without compromising the system's optical performance.
  • FIGS. 3 and 4 show a removable optical assembly 30 that is adapted to the bayonet adapter 50.
  • Optical assembly 30 has an elliptical body profile corresponding to that of the distal face 24 of the housing 12.
  • passages 32, 33 align with light guides 22, 23.
  • Passages 32', 33' also align with other light guides (not shown) inside the housing 12. Light passing distally through the light guides 22, 23 can thus continue unimpeded through the optical assembly 30 toward a target located beyond the distal face 34.
  • Dimensions of the preferred embodiment are shown in Tables 1 and 2.
  • the optical assembly 30 has a central aperture 35 bored therethrough and a lens 38 placed therein.
  • Lens 38 can be any lens or combination of lenses as are known to the art in order to achieve desired optical characteristics such as magnification, field of view, field correction, and the like.
  • a cylindrical recess or well 36 is formed in the proximal face 31.
  • the well 36 has a somewhat larger diameter than the central aperture 35 and is concentric therewith. It is important that the well 36 be located inboard of the passages 32, 32' and 33, 33', so that the distance between the central axis of the well 36 and the closest wall of each of the passages 32, 32', 33, 33' exceeds the radius of the well 36.
  • the primary purpose of this inboard arrangement of the bayonet adapter is to minimize the major and minor axes of the elliptical profile of the housing. Other purposes are to prevent light loss within the system 10, and to block internal light paths between the passages 32, 32', 33, 33' and the imager 14.
  • a plurality of bayonet pins 37a-37d are directed radially toward the center of the well 36.
  • the ends of the bayonet pins 37a-37d protrude inwardly through the wall of the well 36.
  • the well 36 is dimensioned to snugly receive the bayonet adapter 50, and the bayonet pins 37a-37d align with the longitudinal arms 55a-55d of the bayonet tracks 54a-54d respectively.
  • the bayonet pins 37a-37d are initially carried by the longitudinal arms 55a-55d.
  • the system 10 When the optical assembly 30 is thus mounted on the housing 12, the system 10 has a smooth, continuous exterior surface, over which a protective sheath or condom (not shown) can be readily slipped on and off.
  • Actuation of the light source causes light to pass through the bundle 26, light guides 22, 23, and passages 32, 33. Of course light also passes through other light guides (not shown) and through passages 32', 33' to illuminate a target therebeyond. Scattered and reflected light from the target returns to the system in a receive path, representatively indicated by rays 39, 39' in FIG. 1.
  • the receive path passes through the central aperture 35, lens 38, and the interior of well 36.
  • the receive path continues across the proximal face 31 of the optical assembly 30, and enters the housing 12 through its distal end 24.
  • the target can be visualized by the user on a monitor or other suitable display.
  • the optical assembly 30 can be detached from the housing 12 by reversing the steps required to mount it.
  • a reverse twisting motion is first imparted to the optical assembly 30 and the housing 20, so that the two rotate relative to one another about their common central axis, the bayonet pins 37a-37d sliding in the bayonet tracks 54a-54d until the longitudinal arms 55a-55d are reached.
  • the optical assembly 30 is then longitudinally withdrawn from engagement with the bayonet adapter 50. As this occurs the bayonet pins 37a-37d slide in the longitudinal arms 55a-55d of the bayonet tracks 54a-54d.
  • FIGS. 5 and 6 there is shown another optical assembly 40 which is designed for side viewing.
  • Optical assembly 40 has a generally cylindrical shape. Its proximal portion has the same construction as optical assembly 30, and the details are therefore omitted for brevity.
  • the distal portion of optical assembly 40 has a sideward facing shoulder 42 which terminates proximally at a steeply inclined face 43.
  • a central bore 46 extends beyond the bottom of well 36 and terminates at an intersection with a notch 59 that debouches onto the surface of the shoulder 42.
  • Passages 45, 45', 46, 46' are positioned much the same as passages 32, 32', 33, 33' in optical assembly 30, except that they terminate at the base of the face 43, rather than extending to the distal end 48 of the optical assembly 40.
  • the distal ends of passages 45, 45' communicate with the surface of shoulder 42 via notches 47, 47', best seen in FIGS. 5 and 7.
  • An illuminating prism 59 (see FIG. 7) is placed in each of the notches 47, 47' for redirecting light passing through passages 45, 45' in the desired sideward direction.
  • an imaging prism 61 occupies the notch 59 for redirecting light returning from the target through lens 38 and toward the proximal end of the optical assembly 40.
  • Optical assembly 40 is mounted and dismounted in the same manner as optical assembly 30.
  • a chosen optical assembly such as optical assembly 30, or optical assembly 40 is mounted on the housing 12, and a protective sheath slipped over the optical assembly and the housing.
  • the lamp is actuated by a suitable switch (not shown), and the device positioned in the mouth of a patient.
  • the sheath is removed. The process is then repeated with another optical assembly.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Veterinary Medicine (AREA)
  • Pathology (AREA)
  • Public Health (AREA)
  • Biophysics (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Optics & Photonics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Endoscopes (AREA)
EP94117811A 1994-03-15 1994-11-11 Système pour obtenir des images dentaires Withdrawn EP0672379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US213677 1994-03-15
US08/213,677 US5512036A (en) 1994-03-15 1994-03-15 Dental imaging system

Publications (1)

Publication Number Publication Date
EP0672379A1 true EP0672379A1 (fr) 1995-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94117811A Withdrawn EP0672379A1 (fr) 1994-03-15 1994-11-11 Système pour obtenir des images dentaires

Country Status (3)

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US (1) US5512036A (fr)
EP (1) EP0672379A1 (fr)
JP (1) JPH07255667A (fr)

Cited By (19)

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GB2411488A (en) * 2004-02-26 2005-08-31 Winter & Ibe Olympus Videoendoscopic system
EP1849406A1 (fr) * 2006-04-28 2007-10-31 Nizar Mullani Adaptateur pédiatrique pour transillumination
EP2051603A1 (fr) * 2006-07-28 2009-04-29 Novadaq Technologies Inc. Système et procédé de pose et de retrait d'un élément optique sur un objectif d'endoscope
WO2010098807A1 (fr) * 2009-02-24 2010-09-02 Visionscope Technologies, Llc Gaine jetable pour utilisation avec un système d'imagerie
US9642532B2 (en) 2008-03-18 2017-05-09 Novadaq Technologies Inc. Imaging system for combined full-color reflectance and near-infrared imaging
US9814378B2 (en) 2011-03-08 2017-11-14 Novadaq Technologies Inc. Full spectrum LED illuminator having a mechanical enclosure and heatsink
US9877654B2 (en) 2006-02-07 2018-01-30 Novadaq Technologies Inc. Near infrared imaging
US9968244B2 (en) 2000-07-14 2018-05-15 Novadaq Technologies ULC Compact fluorescence endoscopy video system
CN108852291A (zh) * 2018-05-11 2018-11-23 漯河医学高等专科学校 一种手持式口腔三维扫描装置及扫描方法
US10182709B2 (en) 2002-01-15 2019-01-22 Novadaq Technologies ULC Filter for use with imaging endoscopes
US10293122B2 (en) 2016-03-17 2019-05-21 Novadaq Technologies ULC Endoluminal introducer with contamination avoidance
US10595710B2 (en) 2001-10-19 2020-03-24 Visionscope Technologies Llc Portable imaging system employing a miniature endoscope
US10694151B2 (en) 2006-12-22 2020-06-23 Novadaq Technologies ULC Imaging system with a single color image sensor for simultaneous fluorescence and color video endoscopy
US10869645B2 (en) 2016-06-14 2020-12-22 Stryker European Operations Limited Methods and systems for adaptive imaging for low light signal enhancement in medical visualization
USD916294S1 (en) 2016-04-28 2021-04-13 Stryker European Operations Limited Illumination and imaging device
US10980420B2 (en) 2016-01-26 2021-04-20 Stryker European Operations Limited Configurable platform
US10992848B2 (en) 2017-02-10 2021-04-27 Novadaq Technologies ULC Open-field handheld fluorescence imaging systems and methods
US11484189B2 (en) 2001-10-19 2022-11-01 Visionscope Technologies Llc Portable imaging system employing a miniature endoscope
US11930278B2 (en) 2015-11-13 2024-03-12 Stryker Corporation Systems and methods for illumination and imaging of a target

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Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9968244B2 (en) 2000-07-14 2018-05-15 Novadaq Technologies ULC Compact fluorescence endoscopy video system
US11484189B2 (en) 2001-10-19 2022-11-01 Visionscope Technologies Llc Portable imaging system employing a miniature endoscope
US10595710B2 (en) 2001-10-19 2020-03-24 Visionscope Technologies Llc Portable imaging system employing a miniature endoscope
US10182709B2 (en) 2002-01-15 2019-01-22 Novadaq Technologies ULC Filter for use with imaging endoscopes
GB2411488A (en) * 2004-02-26 2005-08-31 Winter & Ibe Olympus Videoendoscopic system
US9877654B2 (en) 2006-02-07 2018-01-30 Novadaq Technologies Inc. Near infrared imaging
US7841751B2 (en) 2006-04-28 2010-11-30 Mulani Nizar A Pediatric adapter for transillumination
EP1849406A1 (fr) * 2006-04-28 2007-10-31 Nizar Mullani Adaptateur pédiatrique pour transillumination
EP2051603A1 (fr) * 2006-07-28 2009-04-29 Novadaq Technologies Inc. Système et procédé de pose et de retrait d'un élément optique sur un objectif d'endoscope
EP2051603A4 (fr) * 2006-07-28 2012-02-22 Novadaq Technologies Inc Système et procédé de pose et de retrait d'un élément optique sur un objectif d'endoscope
US9386909B2 (en) 2006-07-28 2016-07-12 Novadaq Technologies Inc. System and method for deposition and removal of an optical element on an endoscope objective
US11025867B2 (en) 2006-12-22 2021-06-01 Stryker European Operations Limited Imaging systems and methods for displaying fluorescence and visible images
US11770503B2 (en) 2006-12-22 2023-09-26 Stryker European Operations Limited Imaging systems and methods for displaying fluorescence and visible images
US10694151B2 (en) 2006-12-22 2020-06-23 Novadaq Technologies ULC Imaging system with a single color image sensor for simultaneous fluorescence and color video endoscopy
US10694152B2 (en) 2006-12-22 2020-06-23 Novadaq Technologies ULC Imaging systems and methods for displaying fluorescence and visible images
US9642532B2 (en) 2008-03-18 2017-05-09 Novadaq Technologies Inc. Imaging system for combined full-color reflectance and near-infrared imaging
US10779734B2 (en) 2008-03-18 2020-09-22 Stryker European Operations Limited Imaging system for combine full-color reflectance and near-infrared imaging
CN102348404A (zh) * 2009-02-24 2012-02-08 威神斯扣普技术有限公司 与成像系统一起使用的一次性外鞘
WO2010098807A1 (fr) * 2009-02-24 2010-09-02 Visionscope Technologies, Llc Gaine jetable pour utilisation avec un système d'imagerie
US9814378B2 (en) 2011-03-08 2017-11-14 Novadaq Technologies Inc. Full spectrum LED illuminator having a mechanical enclosure and heatsink
US11930278B2 (en) 2015-11-13 2024-03-12 Stryker Corporation Systems and methods for illumination and imaging of a target
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